Unable to clear/update OpenVPN Client Settings

I have an Asus RT-AC3100 on firmware v. 384.5. At some point on firmware a couple versions back, I created an OpenVPN client connection using a NordVPN settings file. I am able to establish the VPN connection without any issues. However, I am now unable to change the server address and port. Whenever I manually change it or use another NordVPN settings file and apply the changes, it is reverted back when the page refreshes. In an attempt to solve this, I reset the router to factory defaults (from the SW menu as well as using the HW button). Once I get the router set back up and log into the admin console, I find that the OpenVPN client settings are still there. What am I missing here?